Traumatic dislocation of the shoulder can result in a Hill-Sachs deformity. The presence of a Hills-Sachs deformity may be associated with recurrent shoulder instability.
The basic Hill-Sachs deformity is a compression fracture of the humeral head.
Shoulder Dislocation
Location of Fracture of Humeral Head
Term
anterior
posterolateral
Hill-Sachs deformity
posterior
anterior
reverse Hill-Sachs deformity
A Hill-Sachs deformity may be accompanied by a concurrent Bankart lesion. The greater the depth of the Hill-Sachs injury the greater the chances of a Bankart lesion (Horst et al).
The size of the deformity can be described on imaging studies bases on depth in mm and volume (Cicak et al).
The volume of the compression fracture can be calculated from width, length and depth of the lesion assuming the the lesion encompasses half of an ellipsoid.
volume in cubic cm =
= 4/3 * PI() * ((width in cm) / 2) * ((length in cm) /2) * (depth in cm) =
= PI()/3*(width in cm)*(length in cm)*(depth in cm)
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